成果報告書詳細
管理番号20110000000918
タイトル*平成22年度中間年報 省水型・環境調和型水循環プロジェクト 水循環要素技術研究開発 有用金属・有害物質の分離・回収技術の開発 (H21-H23)
公開日2011/7/28
報告書年度2010 - 2010
委託先名独立行政法人産業技術総合研究所 日本カニゼン株式会社 独立行政法人日本原子力研究開発機構 株式会社アクアテック 国立大学法人佐賀大学
プロジェクト番号P09011
部署名環境部
和文要約和文要約等以下本編抜粋:1.研究開発の内容及び成果等 (1)抽出法による有価金属回収、汚泥削減技術開発 (1)-1 含浸抽出法によるめっき液長寿命化技術 平成21年度の研究成果により最適化した含浸樹脂は、無電解ニッケルめっき液中に蓄積することで著しくめっき液の寿命を縮める原因になる亜鉛に対して、非常に高い選択的吸着性があることを確認した。本年度は最適化した含浸樹脂の工業化を検討することを目的とした。具体的には、含浸樹脂をカラムに詰めた亜鉛除去装置の設計、亜鉛除去装置を適用して得られためっき皮膜の評価、コスト試算の検討を行った。
英文要約This study aims at developing a common technological basis by renovating extraction, precipitation, and adsorption in order to reduce the energy during the wastewater treatment from surface finishing industries. : In the extraction, equipment was designed for removing zinc from the electroless nickel (EN) plating bath by solvent impregnated resin (SIR) in order to elongate the bath life, and satisfactory plating layer was obtained. Its size was one fifth of the current equipment using solvent extraction. Total cost was estimated to be reduced by 24 % when the bath life was made five times longer. The new solvent extraction apparatus “emulsion flow” was used for nickel recovery from the spent EN plating baths. The performance of this apparatus was confirmed to cut costs significantly compared with that of a conventional mixer-settler extractor. By using a desktop multiple-stage emulsion flow apparatus, about 95% nickel was extracted even when the sodium hydroxide addition was reduced. Zinc adsorption with the SIR from the model EN plating bath was examined, and the adsorption constant was determined. Nickel ion in the aqueous phase is considered to initially react with the PC88A dimer anion adsorbed on to the liquid-liquid interface. : In the precipitation, electroless copper plating waste was treated with Fe-Fenton's oxidation. No reaction was observed in Cu-Fenton’s one of the waste under the ambient temperature, but the reaction started at 50℃. TOC removal of Cu-Fenton’s oxidation was higher than that of Fe-Fenton's one. Cu ions in the treated liquor was precipitated as CuO sludge, not Cu(OH)2. The water content of CuO sludge was less than 60%. By applying the gas-sensor-controlled sulfide method and hydroxide method to the concentrated metallic solution prepared by dissolving various metal hydroxide sludge with mineral acid, metal sulfide as CuS or NiS was separated and recovered. By this system, sludge formation was reduced to 1/5, and the recoveries of various metals were over 80%. From NiS, Ni metal was obtained by aeration and electrolysis. : In the adsorption, removal of boron from aqueous solution by using a novel adsobent was investigated. We synthesized polyarylamine modified with glucose. The optimum degree of cross-linking was 20%, and the optimum temperature range of glucose introduction was 60-80℃. The best amount adsorbed was about 33 mg-B/g-adsorbent, which was two times higher than that of conventional boron-adsorbents. Fluoride was removed by metal loaded orange waste gel. Although leakage of loaded metal ion was observed at pH optimum for the adsorption, it was negligible at high pH for elution. The adsorption took place at low pH on Zr(IV)-loaded gel while it was neutral pH on Al(III)-loaded gel. Although BF4- was effectively removed by Zr(IV)-loaded gel, the selectivity over excess concentration of sulfate was unsatisfactory.
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